Getting the flat-top upper will be around the same price as the A2 mount and you can sell your old one to repay some of the expenses, plus you can use whatever BUIS you like. Should you ever want another optic like an ACOG etc. you will arleady be set up for it. Also, you can mount the EOtech anywhere you want in regards to eye relief with the flat top, in case you decide you don't like it out that far, and if you ever try the 3x multiplier for the Aimpoint/EOTech you have that as an option.
Plus it will look cooler....
